Giant one eyed brain monster in a macabre lab

1970s vintage pulp art, A dark, gothic style horror image of a gigantic brain with one big eye and leathery lips and a horrible smile and thin sinewy arms and legs. The brain is performing an experiment on a creature on its laboratory table. The brain is in his mad scientist lab with specimens in jars and strange old-style electrical stuff in the lab. It is a very creepy and haunting scene.